Central ring portion of a positive displacement pump



FIG. 1 is a front/right side isometric view of a central ring portion of a positive displacement pump;

FIG. 2 is a front elevational view of the pump of FIG. 1;

FIG. 3 is a rear elevational view of the pump of FIG. 1;

FIG. 4 is a right side elevational view of the pump of FIG. 1;

FIG. 5 is a left side elevational view of the pump of FIG. 1;

FIG. 6 is a top plan view of the pump of FIG. 1; and,

FIG. 7 is bottom plan view of the pump of FIG. 1.

The broken line showing of elements is included for the purpose of illustrating environmental matter and forms no part of the claimed design. 

CLAIM The ornamental design for a central ring portion of a positive displacement pump, as shown and described. 